In this profession, a member can take an apprentice (5)
I believe the answer is:
legal
'in this profession' is the definition.
'legal' can be an answer for 'profession' (legal profession is a kind of profession). I'm unsure of the remainder of the definition.
'a member can take an apprentice' is the wordplay.
'a member' becomes 'leg' (member can mean a limb).
'can take' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'an apprentice' becomes 'L' (as in a learner driver with L-plates on their car).
'leg'+'a'+'l'='LEGAL'
Can you help me to learn more?
(Other definitions for legal that I've seen before include "right" , "Constitutional" , "Permissible" , "In accordance with law" , "Street - (1978 Dylan album)" .)